Re: [Mailman-Users] [Mailman-Developers] USE_ENVELOPE_SENDER

2009-02-10 Thread Barry Warsaw

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On Feb 9, 2009, at 5:47 AM, Ian Eiloart wrote:




I agree that the use of USE_ENVELOPE_SENDER as an anti-spoof is
outdated, particularly because it doesn't even come into play for  
the

member/nonmember decision.


Strike three. :)



Our LMTP code is intended to make this decision before the message  
headers are even seen. Perhaps that makes the whole  
USE_ENVELOPE_SENDER option redundant.


I think so too.  How's that coming along?

Barry

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Re: [Mailman-Users] [Mailman-Developers] USE_ENVELOPE_SENDER

2009-02-10 Thread Barry Warsaw

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On Feb 9, 2009, at 5:43 AM, Ian Eiloart wrote:


I'm not sure whether I do use it, but I think I should.

Most of our list users are in our own domain. That domain certainly  
is less spoofable in the envelope, because we don't accept mail from  
our domain unless it's been through our servers. We don't get spam  
with sussex.ac.uk in the envelope sender domain.


With SPF records now widely published, including by several large  
free email service providers, it's certainly within the power of  
sites to validate the envelope sender address of much of their  
inbound email. Losing this facility now would be a great shame.


I certainly don't see how having the option can do much harm.

It might be worth adding code to support BATV, if it isn't there  
already.


MM3 does not yet support this.

So, I've landed a branch that gets rid of the MM3 equivalent to  
USE_ENVELOPE_SENDER, but it will still be possible to consider the  
MAIL FROM or Sender addresses in preference to From, if you wanted  
to.  I've implemented a site admin definable header lookup scheme so  
you can define the order that headers are considered.  By default it's  
From:, MAIL FROM, Reply-To, Sender.  This is a global order just like  
U_E_S was.


Barry

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